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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7e028024dcc86372762cfaa412f0594f7fec72767b9d4f90bf3a51bf40ba4f' 
  AND token = '1PQXpbCnQL+3JVKRl1wrQp5FPBNs73KRKsYdy5ymd34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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