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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd040cf32917948be1b99bd64d5ab7cfba8aa0fc15467f616aad5e7bdcc4eb606' 
  AND token = 'Q+iaxmnbpGiAU2gA1SeZG9L+gur9pJim3SDu/aq+BlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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