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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23751cb2a53c087a79816a62b667495798871841a8ca33ff40680b98fedb4bac' 
  AND token = 'DpU2oca20A/L/r7XMFud2/hOEKjYGVXwT0+oRg6M9yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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