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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0626139be5f443472fadb91235b5e7f2c31a9cd7327332f0f9a0008cb8a9271' 
  AND token = 'IALdEIr0/h2/9kFcL2D7opgq3WnQrcSl8C3BF6QTibI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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