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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aca443bf205cf3883a9fe99505c4edf38801710733b2592aec4b0ebc2c09d27' 
  AND token = 'EbdI8bQAuS0wxtNOyk4C5rHTkeahgSfVfFNEPWRTH6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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