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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75aaa2b6456ce05e6417a61055cd33b9e3f061647da388c99997adfec69a72b6' 
  AND token = 'BZA6y93oH7qxI2M6VD0pL1XAHTrn+jhW9VOr8cXbkyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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