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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432104ee098d217140330956f1b28c5b633c0e437079a99994bb499f78913cf0' 
  AND token = 'sh78Zuowg3fBF1hFJjTTEZvD8iCzBRl7vWKNzA2H0cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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