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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c116a07355e851dcd8a95d802749abfb3fffd1f2751e01ebcc1ed49a2b69d5' 
  AND token = 'uran5YolIyXWTyxKiIMCbN7EJ7m8kPjxIzh9s3itRe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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