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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3819bf5b96afdbbb78a277679ac1156d4aa70221d94c12eb53abd70c9e8b1b' 
  AND token = 'Aa0EudauwjJ+OkG5LLseeiakC+4WE+EoqAqBr/4KSFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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