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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3857bf69945a4fb97e4e9928fcc2decd32a1660c0d8939566e837af4302d7982' 
  AND token = 'D9yUdIdPma4bsO2U+yGig0gBajFWEoiDPYu28Mpr7vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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