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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88eff6c23460f7dbb1985cf281026d1d6bf40d01a13fa6609a0e65f2d3fe1525' 
  AND token = '6GvNrDAUUTYCAQ7QfCs8wYE3Sh4p3EXL8i/tAmsI94E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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