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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089d108ab6c9cf58e697a2ee00c40f3a187d58d0800586fb03b234c8cba7dd68' 
  AND token = 'd7KvrESJTm60DCIsu8elQ52UeBUAnqhUu3DREaAadqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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