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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ed1f1b529feaa6c90a732d2b5a3a64b8c16ee060139e4d09a69313cbb05d45' 
  AND token = '7WmlKQN8/YfNab8cj+6+QxkUMfVKxXq/wPpKq53RT1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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