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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3d765269b157200f81ea767bb43a64032f10ca28e8ce3d9593d51eadfc6298' 
  AND token = 'a6znInHQ4MWk+Aafhy41iUh/d6fbo5yt3MP62QEEFYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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