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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e90102d2d0dc86d79d1f036d1760541ecb68777e1d670a3d05a2cb991c5489' 
  AND token = 'tFEqVjVDLAwGWVr5k2S/8Zuxj25VB/I2OfwEF3TgU9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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