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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a22c46c5a43c45633aa7d23a65831e9405a8536ebbe09bb606da52bf407847d' 
  AND token = 'CA1f30dm0r/d4l+EkqN5cMZhcSBeE3rjuEXWxao/hOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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