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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9f252e08a0ceb1a6de33f7d1446df9ac58e1908098177fca6d67dd994d221e' 
  AND token = '/7lJBlOU5ywZvPhud0ZZ2qgiyQppMWMPRwZ13iUOuvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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