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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07bb4179b470df87790df6133531672926baad6864aea70d16a54ad15d5ef11' 
  AND token = 'Dd8Vx9bZeBbLh83spjmwFeaKCmu6hgXICSbtaxplGeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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