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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9541905493839dd932ff98b4ab6f205926d1ee41d28db80631e2e63be0cadecf' 
  AND token = 'AeBoGMxJOSJugjbbEpO5KMWiQ4wjq51R2IzRPBbK7EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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