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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c90968447d3deb56524c43e27964421726cacfe07ccb43b1ee0950b9fd41b4' 
  AND token = 'QWM0LkTreie411j8LFY71nvXARKlrdd1AWQc5EUQCJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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