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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e19455be2a2e8338ed23ad6225be070b9bd9faa638cca1d20972d2aec22d7d' 
  AND token = 'PIF0NcT8yCY5+Jf2LhQBD/MxT+7mCYdknKUcgAyOglk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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