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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6b9845c1bdab5d68841c4d1c380e9dbf0b6ede1dbe769a8fe93364d74e8218' 
  AND token = 'Ioup2SSNUuVVolto88AbznrmsPV6vEEA4h7D3dGFjVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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