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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0899e5b3785888e4a6862f6b332af94307a8670756d43357598e507c93179005' 
  AND token = 'MFoJM+v745eZj9j2X4kPbagU7Qm0Uoo9rOq3Zs/Ob+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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