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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f905d21269c78aad1966319c67272d447b0045b71b4126d11b8fa0e92425dd5e' 
  AND token = '146CVdR+7MfcNQOYRdF3fYsytwn5ZYfB5wY0p8UEI40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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