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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1742529eb6e6b078d2a60d574cafb25f8c59f464555d01a18b2c32dce254b2c' 
  AND token = 'vC58t6s5sqUXeTj4r4M1ysPCszsP2rR57vLOL+LbB1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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