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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee91e7eac525ed1efe7827de152e7f22f5cb5c07306e66f570ee64f2c582d7c' 
  AND token = 'KdT2FFAledLglVx1a8kF9snsK7iaV99y01xx1QRcii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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