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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00b19cdbc5805c24e8c3ca05a844f63b479bedea9372610447b2293d35ac4bd' 
  AND token = '/OlXg1WyTfna9SzTYTQdDfRZBoJzrKzXkdT3SRLntrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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