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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fced982f47abc5ac5d17d8c5a633fc8ca8cf29d862d8e1ca3a38de72053bad' 
  AND token = '17W6OOvo3Nsfeor4/dbGxz4SyBJUztybPyYZkVgC9tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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