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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65796a6cc5d21f1d9e1506b74d9e5fcf314c5e9e76a1b56ef2f3a9cc29b0092e' 
  AND token = 'T8SkvtXR5pimicrPtBRMZZShAso3dK51bw+dWqB0S5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}