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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624967bb51dc2b23fe56e69575f384b1ab176aa20664e69c8ae0badd1fcdf38b' 
  AND token = 'hZcOcRuvuu41B9OWLClQ2J7TCd+D5Z5R8y7aXb4OvnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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