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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a97906924b075d68a9f3c1d16c2586dbf95575009add37ba7b188b4d52bde09' 
  AND token = 'Sb3oY+4r7H4LoUPPGZ//buDG/8t21wELrJrhxWYPoWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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