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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87eebd2675ee32b6f56d0ab76a1622eec8426947651d520fa9faa7a4de4b4020' 
  AND token = 'QriwUem2EyS+pGUD0yxRhbuXTRIm13V3rKGj41ghHwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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