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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5090df09c009a703b1a86026b37e0a7b8ecde0c06ae7757e38896c1ff68ae4' 
  AND token = 'LuHPIEBOmKrRjHDyVqe/HIXoCkocZIZyZ01N7mF53Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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