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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133d89a00b02a626272b0b3f994a47aae84934cd47795825d3aaad04e0c992e1' 
  AND token = 'LOO8l9EqyEm4Ej8PfSuVDvNhIBhJDglyEp73viD0QHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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