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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5e4e5d31d5c585480ca5851b42fa600f1b98c7698ddc654297a9e25c5e0455' 
  AND token = 'zAwbbX/7egoddo5eKeykoooJtG6e8mMQay9aeA3AOrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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