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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1229d44df565679d1c22240d78affb373e8c9ccfa8bbac300478613584c0cdd' 
  AND token = 'EaXbdkH6tQfEV/ue6cjGKZf6YpZS1JQsOOqP77o6lwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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