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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7085acb2fcecab7b3bddb6efe57f1f4ec1a7cd4351eb89aac9694a1cb72a2e61' 
  AND token = 'cW5M/8m6D8khLRDNauSPODjJ4mqoQnqk7Gz9ZT4rSA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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