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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26918d9dac2dae241fd50599bce1872289acd5b54b7dac5494be1c37bfc0b42f' 
  AND token = 'wOVjZj9FpCVsZM7WrrGiHU5cmy6/r8as4W2GYGe6mRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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