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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06db8a66226e281fdbdf252ba992c9d9f6f34b06d3b1b7adee58f1567e129206' 
  AND token = 'IhZNll+Fz4L52HPK0kCpWcR4b1W5JIKND0gJib18OVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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