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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c096286c8bed38f8b35303685552c08254fafb48c733c89ff17215ea49b66b' 
  AND token = 'sJnO4faJKqpyJsT0nO5BhP8xUvKd0X8K767Rkuxgl6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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