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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c06ac8d30c9529193d2ab0761bf3b0efa6b6cb37534e24c86964659f9cc986' 
  AND token = 'y+sTa1nVdVZxl47PL3qf7J2stGyVhreAkZj6UiGKhm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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