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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9be85bd1ac4c10d5cb85ed21a071f6f670149a75b4f6cf6998a1dec111caa0' 
  AND token = 'WSSeREOIke+kVYRZdQuNnFV8LIBzoQwuLSbMA0nV5Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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