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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176e4ad716dfea1ca59664dd53b3ef17cd571a82e22c7724e66238b1a70373fa' 
  AND token = 'wB6Jgsdail58qAQbFIwGdCIRszo31/b7SCy+gz+zGNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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