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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919a75080ce12c2a2e6cbb6764eb396d227442b2b95c823b3bf7c879bd497efc' 
  AND token = 'Ar21N751GHu3/jUU0aX6mtkbNOlZoCNIp1yqQmfpJwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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