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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb96cade5f19c9d9f35604c99b0ab829caf6a7c9b572427921d430685f8c979' 
  AND token = 'iLV6TldaFKSWOyunE24NgLP5akJBkIQvtI74ck6ySjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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