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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc0237427f9d5be849816c359bfd0244c901f9c4852ce42dfc7b307c90af558' 
  AND token = 'TF8z9hXdnUrHN7dgzHylX9j/8K0POOTRx1MAsJYnQnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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