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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa453e83744b190072227bf8bd188ae90484612d81504bf594e16cf10b8ce29b' 
  AND token = '2hEdP+lK+rohMPU6aYUtmuQnmZH91rjvFn4gI2kzTyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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