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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee1f620983a8be16f290babd8f430086a5eb430a36f4e2a59440d4fe1f8eeb3' 
  AND token = '1Er8emmbqJkmdFWqcfxtNP/hLl44rXO8NejoWK1lhAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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