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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7cac7c9113b4a388e8604f4ad911280f76922042456f3ed3e9265c0e0c2134' 
  AND token = 'HU87emvQddA4XGCcD1Klm1H7wo+vISUg5BdPAKeCqNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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